First of all, What you see in the pictures, is stock wiring. Those 2 wires that have the tape are shielded and the tape covers the shield- wire to ground connection.
Also the injector outputs connected to those thick yellow and yellow black wires.

Your problem sounds very frustrating because injectors are wired in batch 1-3 and 2-4 so we can't say that there is an injector output failure of faulty wire on ecu side, as the failed supposed failed injectors are in different batches.check all your injector connectors' white-red wire pins for 12v presence while having key to on position so you can be sure they are powered and then we can move on in further investigation.

Well it seems after much tinkering and fiddling it came back to two of my new Iridium NGK having a **** poor spark.
Plugs were quite black so it seems auto tune has left me a little on the rich side,
but however i have 4 cylinders back again. after some cleaning.
Kind of a strange coincidence the 1 and 4 both went at the same time and given that it drove in to the garage fine but i guess the short run home on its last outing didn't get it off rich mix.

Thanks again i shall return to my world of searching info before posting again =)